Core Biology - Fertility and menstrual cycle - AQA

HORMONES IN THE MENSTRUAL CYCLE 1) FSH produced by pituitary gland matures an egg and stimulates oestrogen 2) Oestrogen produced by ovaries inhibits the production of FSH and stimulates LH. This thickens the lining of the womb. 3) LH produced by pituitary gland releases the egg.HORMONES FOR CONTROLLING FERTILITYSTOPPING PREGNANCY = ORAL CONTRACEPTIVESENCOURAGING PREGNANCY = IVF TREATMENTOral contraceptives 1) At first it contained lots of oestrogen caused headaches, high BP and nausea 2) Then and now it contains Oestrogen and Progesterone this cause less side effectsProgesterone thickens the entrance of the womb to stop sperm from getting inAdvantages: over 99 per cent effective, reduces the risk of getting cancerDisadvantages: Not 100 per cent chance, cause side effects and doesn't protects against STD'SIVF treatment ­ when not enough FSH being produced 1) Fertility drug containing FSH and LH causes release of several mature eggs 2) Take out the eggs and put into a petri dish 3) Fertilise those eggs by injecting the sperm from the father which joins to the eggs 4) Form embryos, then inject the embryo back into the mother 5) PREGNANT WOOP WOOPAdvantages: Helps a lot of women get pregnantDisadvantages: Doesn't always work, expensive and chance of multiple births